scholarly journals The pH-dependence and group modification of β-lactamase I

1975 ◽  
Vol 149 (3) ◽  
pp. 547-551 ◽  
Author(s):  
S G Waley
Keyword(s):  
Ph Dependence ◽  
Water Soluble ◽  
Side Chain ◽  
Polar Group ◽  
Woodward’S Reagent K ◽  
Group Modification ◽  
Penicillanic Acid ◽  
Lactam Ring ◽  
Parameter Versus ◽  
Hydrolysis Of

The pH-dependence of the kinetic parameters for the hydrolysis of the β-lactam ring by β-lactamase I (penicillinase, EC 3.5.2.6) was studied. Benzylpenicillin and ampicillin (6-[D(-)-α-aminophenylacetamido]penicillanic acid) were used. Both kcat. and kcat./Km for both substrates gave bell-shaped plots of parameter versus pH. The pH-dependence of kcat./Km for the two substrates gave the same value (8.6) for the higher apparent pK, and so this value may characterize a group on the free enzyme; the lower apparent pK values were about 5(4.85 for benzylpenicillin, 5.4 for ampicillin). For benzylpenicillin both kcat. and kcat./Km depended on pH in exactly the same way. The value of Km for benzylpenicillin was thus independent of pH, suggesting that ionization of the enzyme's catalytically important groups does not affect binding of this substrate. The pH-dependence of kcat. for ampicillin differed, however, presumably because of the polar group in the side chain. The hypothesis that the pK5 group is a carboxyl group was tested. Three reagents that normally react preferentially with carboxyl groups inactivated the enzyme: the reagents were Woodward's reagent K, a water-soluble carbodi-imide, and triethyloxonium fluoroborate. These findings tend to support the idea that a carboxylate group plays a part in the action of β-lactamase I.

Rashes with Ampicillin

1980 ◽  
Vol 1 (7) ◽  
pp. 197-201
Author(s):  
Michael J. Kraemer ◽  
Arnold L. Smith
Keyword(s):  
Penicillin G ◽  
Side Chain ◽  
Gram Negative Bacteria ◽  
Acid Moiety ◽  
Structure Activity ◽  
Body Tissues ◽  
The Family ◽  
Acyl Side Chain ◽  
Penicillanic Acid ◽  
Lactam Ring

Ampicillin, first introduced in 1961, has probably become the most widely used penicillin in clinical pediatrics. STRUCTURE ACTIVITY RELATIONSHIPS All penicillins contain the 6-amino penicillanic acid moiety (Fig 1). Its structure includes a thiazolidine ring (A), a β-lactam ring (B), the source of antibacterial activity, and an acyl side chain (R), containing a variety of substitutions creating the family of semisynthetic penicillins. The only difference between ampicillin and penicillin G is the presence of an amino group in the acyl side chain (Fig 1). PHARMACOLOGY AND BACTERIOLOGY Ampicillin is a semisynthetic penicillin, active against Streptococus pneumoniae and certain Gram-negative bacteria, including most Haemophilus influenzae, Escherichia coli, and certain Proteus species. Compared to penicillin G, it has increased stability in acid solutions: a property facilitating oral administration and absorption. It penetrates into most body tissues; effective entry into CSF, however, occurs only with inflamed meninges. The serum half-life with normal renal function varies from four hours in newborns1 to 1.3 hours in adults.2 Ampicillin can cause an allergic, or nonallergic skin rash (Fig 2). ALLERGY Allergy (for the purposes of this discussion) is defined as a specific immunologic interaction, between either antigen and antibody, or antigen with a sensitized lymphocyte, resulting in a clinically deleterious effect. Implicit is a prior contact with the antigen.

scholarly journals Essential carboxy groups in xylanase A

1990 ◽  
Vol 270 (1) ◽  
pp. 91-96 ◽  
Author(s):  
M R Bray ◽  
A J Clarke
Keyword(s):  
Catalytic Mechanism ◽  
Ph Dependence ◽  
Schizophyllum Commune ◽  
Gel Filtration ◽  
Enzymic Activity ◽  
Water Soluble ◽  
Significant Activity ◽  
Nitrobenzoic Acid ◽  
Woodward’S Reagent K ◽  
Activity Loss

An endo-1,4-beta-xylanase of Schizophyllum commune was purified to homogeneity through a modified procedure employing DEAE-Sepharose CL-6B and gel-filtration chromatography on Sephadex G-50. The role of carboxy groups in the catalytic mechanism was delineated through chemical modification studies. The water-soluble carbodi-imide 1-(4-azonia-4,4-dimethylpentyl)-3-ethylcarbodi-imide iodide (EAC) inactivated the xylanase rapidly and completely in a pseudo-first-order process. Other carbodi-imides and Woodward's Reagent K were less effective in decreasing enzymic activity. Significant protection of the enzyme against EAC inactivation was provided by a mixture of neutral xylo-oligomers. The pH-dependence of the EAC inactivation revealed the presence of a critical ionizable group with a pKa value of 6.6 in the active site of the xylanase. Treatment of the enzyme with diethyl pyrocarbonate resulted in modification of all three histidine residues in the enzyme with 100% retention of original enzymic activity. Titration of the enzyme with 5,5-dithiobis-(2-nitrobenzoic acid) and treatment with iodoacetimide and p-chloromercuribenzoate indicated the absence of free/reactive thiol groups. Reaction of the xylanase with tetranitromethane did not result in a significant activity loss as a result of modification of tyrosine residues.

scholarly journals Hydrolysis of penicillins and related compounds by the cell-bound penicillin acylase of Escherichia coli

1969 ◽  
Vol 115 (4) ◽  
pp. 733-739 ◽  
Author(s):  
M. Cole
Keyword(s):  
Escherichia Coli ◽  
Penicillin Acylase ◽  
Side Chain ◽  
Bacterial Cells ◽  
Optimum Temperature ◽  
Phenoxymethyl Penicillin ◽  
Optimum Ph ◽  
Penicillanic Acid ◽  
Hydrolysis Of ◽  
Related Compounds

1. A method is given for the preparation of penicillin acylase by using Escherichia coli N.C.I.B. 8743 and a strain selected for higher yield. The enzyme is associated with the bacterial cells and removes the side chains of penicillins to give 6-amino-penicillanic acid and a carboxylic acid. 2. The rates of penicillin deacylation indicated that p-hydroxybenzylpenicillin was the best substrate, followed in diminishing order by benzyl-, dl-α-hydroxybenzyl-, 2-furylmethyl-, 2-thienylmethyl-, d-α-aminobenzyl-, n-propoxymethyl- and isobutoxymethyl-penicillin. Phenylpenicillin and dl-α-carboxybenzylpenicillin were not substrates and phenoxymethyl-penicillin was very poor. 3. Amides and esters of the above penicillins were also substrates for the deacylation reaction, as were cephalosporins with a thienylmethyl side chain. 4. For the deacylation of 2-furylmethylpenicillin at 21° the optimum pH was 8·2. The optimum temperature was 60° at pH7. 5. By using selection A of N.C.I.B. 8743 and determining reaction velocities by assaying yields of 6-amino-penicillanic acid in a 10min. reaction at 50° and pH8·2, the Km for benzylpenicillin was found to be about 30mm and the Km for 2-furylmethylpenicillin, about 10mm. The Vmax. values were 0·6 and 0·24μmole/min./mg. of bacterial cells respectively.

Mutational analysis of the two zinc-binding sites of the Bacillus cereus 569/H/9 metallo-β-lactamase

2002 ◽  
Vol 363 (3) ◽  
pp. 687-696 ◽  
Author(s):  
Dominique de SENY ◽  
Christelle PROSPERI-MEYS ◽  
Carine BEBRONE ◽  
Gian Maria ROSSOLINI ◽  
Michael I. PAGE ◽  
...  
Keyword(s):  
Bacillus Cereus ◽  
Mutational Analysis ◽  
Ph Dependence ◽  
Catalytic Efficiency ◽  
Carbonyl Oxygen ◽  
Zinc Ions ◽  
Wild Type ◽  
Lactam Ring ◽  
Hydrolysis Of ◽  
Low Activity

The metallo-β-lactamase BcII from Bacillus cereus 569/H/9 possesses a binuclear zinc centre. The mono-zinc form of the enzyme displays an appreciably high activity, although full efficiency is observed for the di-zinc enzyme. In an attempt to assign the involvement of the different zinc ligands in the catalytic properties of BcII, individual substitutions of selected amino acids were generated. With the exception of His116→Ser (H116S), C221A and C221S, the mono- and di-zinc forms of all the other mutants were poorly active. The activity of H116S decreases by a factor of 10 when compared with the wild type. The catalytic efficiency of C221A and C221S was zinc-dependent. The mono-zinc forms of these mutants exhibited a low activity, whereas the catalytic efficiency of their respective di-zinc forms was comparable with that of the wild type. Surprisingly, the zinc contents of the mutants and the wild-type BcII were similar. These data suggest that the affinity of the β-lactamase for the metal was not affected by the substitution of the ligand. The pH-dependence of the H196S catalytic efficiency indicates that the zinc ions participate in the hydrolysis of the β-lactam ring by acting as a Lewis acid. The zinc ions activate the catalytic water molecule, but also polarize the carbonyl bond of the β-lactam ring and stabilize the development of a negative charge on the carbonyl oxygen of the tetrahedral reaction intermediate. Our studies also demonstrate that Asn233 is not directly involved in the interaction with the substrates.

scholarly journals Inhibition of class C β-lactamases by (1′R,6R)-6-(1′-hydroxy)benzylpenicillanic acid SS-dioxide

1985 ◽  
Vol 225 (2) ◽  
pp. 435-439 ◽  
Author(s):  
G C Knight ◽  
S G Waley
Keyword(s):  
Side Chain ◽  
Beta Lactamase ◽  
Beta Lactam ◽  
Beta Lactamases ◽  
Beta Lactam Antibiotics ◽  
Lactam Ring ◽  
Class C ◽  
Hydrolysis Of

beta-Lactamases, enzymes that catalyse the hydrolysis of the beta-lactam ring in beta-lactam antibiotics, are divided into three classes, A, B and C, on the basis of the structures so far determined. There are relatively few effective inhibitors of class C beta-lactamases. A beta-lactam sulphone with a hydroxybenzyl side chain, namely (1′R,6R)-6-(1′-hydroxy)benzylpenicillanic acid SS-dioxide (I), has now been studied. The sulphone is a good mechanism-based inhibitor of class C beta-lactamases. At pH8, the inhibition of a Pseudomonas beta-lactamase is irreversible, and proceeds at a rate that is about one-tenth the rate of concurrent hydrolysis. The labelled enzyme has enhanced u.v. absorption and is probably an enamine. At a lower pH, however, inhibition is transitory.

scholarly journals Products of aminolysis and enzymic hydrolysis of the cephalosporins

1970 ◽  
Vol 116 (3) ◽  
pp. 371-384 ◽  
Author(s):  
J. M. T. Hamilton-Miller ◽  
G. G. F. Newton ◽  
E. P. Abraham
Keyword(s):  
Amino Acids ◽  
Aqueous Solutions ◽  
Physical Properties ◽  
Side Chain ◽  
Enzymic Hydrolysis ◽  
Weakly Alkaline ◽  
Immunological Properties ◽  
Amino Compounds ◽  
Lactam Ring ◽  
Hydrolysis Of

1. The reaction of cephalosporins with ammonia, amino acids and other simple amino compounds in weakly alkaline aqueous solutions yields labile compounds with λmax. 230nm. The reaction of deacetyl- and deacetoxy-cephalosporins under similar conditions yields compounds with λmax. 260nm. 2. Hydrolysis with a β-lactamase results in the formation of compounds with λmax. 230nm from deacetylcephalosporins and cephalosporins, but not from deacetoxycephalosporins. 3. These different compounds decompose to give penaldates and penamaldates derived from the side chain and the carbon atoms of the β-lactam ring. 4. Derivatives similar to those obtained with simple amino compounds appear to be formed when cephalosporins and their analogues react with lysine polymers. 5. Some of the chemical and physical properties of the various derivatives have been studied and tentative structures for them are proposed. 6. Possible implications of the results in relation to the immunological properties of the cephalosporins are discussed.

Synthesis of Normuramic Acid Carba Analog and Its Glycopeptide Derivative Resistant to β-Elimination Splitting of the Side Chain

2000 ◽  
Vol 65 (11) ◽  
pp. 1726-1736 ◽  
Author(s):  
Miroslav Ledvina ◽  
Radka Pavelová ◽  
Anna Rohlenová ◽  
Jan Ježek ◽  
David Šaman
Keyword(s):  
Ethyl Ester ◽  
Alkaline Hydrolysis ◽  
Benzyl Ester ◽  
Side Chain ◽  
Propanoic Acid ◽  
Hydrolysis Of

Carba analogs of normuramic acid, i.e., 3-(benzyl 2-acetamido-2,3-dideoxy-4,6-O-isopropylidene-α-D-glucopyranosid-3-yl)propanoic acid derivatives (nitrile or esters) 3a-3c were prepared by addition of radicals generated from benzyl 2-acetamido-2-deoxy-4,6-O-isopropylidene-3-O-[(methylsulfanyl)thiocarbonyl]- (2a) or -3-O-(phenoxythiocarbonyl)-α-D-glucopyranoside (2b) with Bu3SnH to acrylonitrile or acryl esters. Alkaline hydrolysis of ethyl ester 3c afforded 3-(benzyl 2-acetamido-2,3-dideoxy-4,6-O-isopropylidene-α-D-glucopyranosid-3-yl)propanoic acid (5). Coupling of acid 5 with L-2-aminobutanoyl-D-isoglutamine benzyl ester trifluoroacetate and subsequent deprotection of the intermediate 6 furnished N-[3-(2-acetamido-2,3-dideoxy-α-D-glucopyranosid-3-yl)propanoyl]-L-2-aminobutanoyl-D-isoglutamine (7).

scholarly journals Optimizing Chitin Depolymerization by Lysozyme to Long-Chain Oligosaccharides

Marine Drugs ◽  
2021 ◽  
Vol 19 (6) ◽  
pp. 320
Author(s):  
Arnaud Masselin ◽  
Antoine Rousseau ◽  
Stéphanie Pradeau ◽  
Laure Fort ◽  
Rodolphe Gueret ◽  
...  
Keyword(s):  
Time Course ◽  
Water Soluble ◽  
Organic Fertilizers ◽  
Symbiotic Associations ◽  
Egg White Lysozyme ◽  
Hen Egg White ◽  
Ecological Transition ◽  
Optimized Conditions ◽  
Hydrolysis Of ◽  
Long Chain

Chitin oligosaccharides (COs) hold high promise as organic fertilizers in the ongoing agro-ecological transition. Short- and long-chain COs can contribute to the establishment of symbiotic associations between plants and microorganisms, facilitating the uptake of soil nutrients by host plants. Long-chain COs trigger plant innate immunity. A fine investigation of these different signaling pathways requires improving the access to high-purity COs. Here, we used the response surface methodology to optimize the production of COs by enzymatic hydrolysis of water-soluble chitin (WSC) with hen egg-white lysozyme. The influence of WSC concentration, its acetylation degree, and the reaction time course were modelled using a Box–Behnken design. Under optimized conditions, water-soluble COs up to the nonasaccharide were formed in 51% yield and purified to homogeneity. This straightforward approach opens new avenues to determine the complex roles of COs in plants.

scholarly journals Synthesis of Fluorescent Carbon Dots and Their Application in Ascorbic Acid Detection

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1246
Author(s):  
Tengfei Wang ◽  
Hui Luo ◽  
Xu Jing ◽  
Jiali Yang ◽  
Meijun Huo ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Fluorescence Intensity ◽  
Carbon Dots ◽  
Ph Dependence ◽  
Scale Up ◽  
Water Soluble ◽  
Jujube Fruit ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Water-soluble fluorescent carbon dots (CDs) were synthesized by a hydrothermal method using citric acid as the carbon source and ethylenediamine as the nitrogen source. The repeated and scale-up synthetic experiments were carried out to explore the feasibility of macroscopic preparation of CDs. The CDs/Fe3+ composite was prepared by the interaction of the CDs solution and Fe3+ solution. The optical properties, pH dependence and stability behavior of CDs or the CDs/Fe3+ composite were studied by ultraviolet spectroscopy and fluorescence spectroscopy. Following the principles of fluorescence quenching after the addition of Fe3+ and then the fluorescence recovery after the addition of asorbic acid, the fluorescence intensity of the carbon dots was measured at λex = 360 nm, λem = 460 nm. The content of ascorbic acid was calculated by quantitative analysis of the changing fluorescence intensity. The CDs/Fe3+ composite was applied to the determination of different active molecules, and it was found that the composite had specific recognition of ascorbic acid and showed an excellent linear relationship in 5.0–350.0 μmol·L−1. Moreover, the detection limit was 3.11 μmol·L−1. Satisfactory results were achieved when the method was applied to the ascorbic acid determination in jujube fruit. The fluorescent carbon dots composites prepared in this study may have broad application prospects in a rapid, sensitive and trace determination of ascorbic acid content during food processing.

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